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                外公的难题                </h1>
                <p>时间限制：3s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span class="Apple-style-span" style="word-spacing: 0px; font: medium Arial,Microsoft Yahei,Simsun,sans-serif; text-transform: none; color: rgb(0,0,0); text-indent: 0px; white-space: normal; letter-spacing: normal; border-collapse: separate; orphans: 2; widows: 2; webkit-border-horizontal-spacing: 0px; webkit-border-vertical-spacing: 0px; webkit-text-decorations-in-effect: none; webkit-text-size-adjust: auto; webkit-text-stroke-width: 0px"><span class="Apple-style-span" style="font-size: 15px; line-height: 22px; font-family: 宋体">　　 Happy老爷爷的外孙Jacky能写会算，聪明绝顶，老爷爷非常喜欢他。Jacky最喜欢算24点了，可是因为他的知识还不够，他只会做加法，减法和乘法，另外也会使用括号。这次外公给他出了一道难题：从N张牌中任选若干张分成M墩( 每墩不超过5张牌)，使得每墩的各张牌都可以算出24点。这本来并不困难，但是外公又要求M的值最大，这可难坏了小Jacky。你愿意帮帮他吗？<span class="Apple-converted-space">&nbsp;</span><br />
</span></span></p></p><hr/><h3>输入格式</h3><p><p><font size="3"><font face="宋体">共有两行，第一行包含一个数n(1&lt;=n&lt;=20),表示牌的张数。第二行有N个数依次为各张牌的点数，每个数为1~10的整数，以空格分开。<span class="Apple-converted-space">&nbsp;</span><br />
<br />
　<br />
　　</font></font></p></p><hr/><h3>输出格式</h3><p><p><font size="3"><font face="宋体">仅有一个数为M的最大值．<span class="Apple-converted-space">&nbsp;</span></font></font></p></p><hr/><h3>样例输入</h3><pre>6
1 2 3 4 5 6</pre><hr/><h3>样例输出</h3><pre>2</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>曙光OI第四次比赛</p>
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